Change-speed-gear mechanism



Jufly 24, 1923- L462 74 J. COTAL CHANGE SPEED GEAR MECHANISM Filed Jline 2a, 1920 2 Shoots hooik 2 l N O Patented July 24, E923.

Parana orator- J COTAL, 0F PUTEAUX, FRANCE.

GE-SPEED-GJEAR MECSIEI.

Application filed June 28, 1920. Serial No. 892,459.

(GEED UNDER Tm ERQVISIONS 0F rm ACT OF MARCH 3, 11921, 41 STATE. L, 1813.). p i

To all whom it may concern:

Be it known that I, JEAN COTAL, a citizen of the Republic of France, residing at Puteaux, France, have invented new and use- 5 ful Improvements in Ghange-Smeed-Gear Mechanisms, for which ll filed an application in France January 11, 1917, No. 499,476, and Great Britain, July 31, 1919, No. 135,-

4 450, of which the following is a specification. This invention relates to improvements in change speed gears, the object of the invention being toprovide improved apparatus of this kind which enables four forward speeds tobe obtained, and also allows brak- 35 ing and a rear speed to be obtained by electrically operated means, and which also provides mechanically operated means for driving in first speed in the event that the elec tric power fails.

With the above and other objects in view,

the invention consists in the construction,

Y combination and arrangement of devices hereinafter described and claimed. In the accompanying drawing Fig. l is an axial longitudinal section of the mechanism; and

Fig. 2 is a cross section showing specially the mechanic control.

The apparatus comprises a primary shaft 3f) h. secured to the driving shaft and which rotates, accordingly, at same speed as said shaft, and two intermediary shafts B and C parallel to shaft A, mounted on a plate 10 keyed on shaft A. Said shafts l3 and C 3 may rotate freely in bearings carried by the plate, as shown in Fig. 1. U The mechanism is enclosed in a cylindrical casing a and on one of the fiat bottoms of the latter are fixedtwo electro-ma ets 40 E and F. Two other electro-magnets and H arefixed on secondary shaft and can ried by a plate 7': which is connected to said shaft.

A commutator may send an electric cur- 5 rent to magnets E and F by means of the block b and to magnets G and H by brushes as a which rub on annular collectors d and d respectively.

Cir ular ri gs e f g h are respectively connected tosun gears E F G H forming to th armature of magnets E. F. G. H.

On the upper part of the apparatus is located a lever ll pivoted on a pin a" which carries also a toothed segment j engaging with a similar segment j pivoted on a pin '5' located at the lower part of the apparatus, as shown in the drawings, so that by actuating the lever I, the two pins will turn simultaneously. Said two pins have, on a part of their length, a cam-shaped cross section and such parts pass through collars L diametrically opposed to each other and fined on a ring Z which may be moved to the right or to the left, according to the direc tion of rotation transmitted to the lever L Hence the said ring may be brought close to the armature e which then engages the magnet E with which it may become connected by friction. The lever ll carries a spring piece m acting as a" pawl on the l? toothed part of a fixed toothed segment m and as a locking device when it is engaged in a recess M of said segment in resting position.

As will be seen in the drawings, the mag net Gr ma be secured to the armature g by moving t e screw n which engages corre sponding recesses n of armature g. This may be readilydone by means of screwdriver engaged in a threaded hole provided in the bottom-of the casing and closed with a plug 0. i

Working, first speed-When the motor has been started the plate D is fast to its shaft, current is sent into electro-magnets G. Gear E is thus fixed, while the gear G becomes fast to the shaft K.

The satellites lP keyed on the secondary shafts 1B and C rotate simultaneously on themselves and around the primary. shaft W A rolling on gear 1E which is lined and said satellites drive to their own speed the satellites Q fast. on said shafts B and G. The latter actuate in their turn the planetary pinion E which is fast to the secondary Q5 shaft K, which is thus driven at reduced speed in the same direction as the primary ft A? a Second speed-Current is sent into the electro-magnets F and H; the gear F is thusstationary and H becomes fast to the shaft K; satellites R and S enter in action to produce same result as formerly.

lThz'rd speed.Current is sent into F and The gear F is thus fixed and gear Gr is made fast to the shaft K: The satellites R and Q are then revolved.

F O'Mflb speed.-Current is sent into the ma nets G and H; planetary pinions G and H are thus made fast to the secondary shaft K and satellites S and Q actas a carrier, as they cannot rotate with their planetary pinions, since the engaging pair is not in same ratio.

Accordingly, the secondary shaft K rotates at same speed as shaft A. In short, this fourth speed is obtained in direct engagement and all pinions are stationary relatively to each other and their only effect is to increase inertia of the driving fly wheel.

Braking-efi'ect.A progressive current is sent into the fixed magnets E and F, and this acts progressively on plates e and f to produce a braking effect. w

Rear wo rlqcng.Rear working is obtained by sending current into magnets E and H; ear E is fixed, inion H, is fast to shaft the satellites g are fast with the satellites P and they exert a reaction on gears H which are obliged to rotate in opposite direction to the primary shaft A, driving the secondary shaft K in its movement.

Emergency speed-4f the source of electric power fails for any reason, screws n are driven into their recesses 11,: the act thus as keys between the magnet G an its armature 9 so that they become fast; after the motor has been started, the lever I is operated so, as to rotate shafts i and i and these in their movement, apply progressively the ring Z a ainst armature e and then against magnet E, which produces a clutching eflect sufiicient to start and drive at first speed without sliding. Assoon as adherence be- 'tween armature a and magnet E becomes suflicient, lever I is released and same is then held in working position by engagement of pawl m with one of the teeth of segment m. For stop[ping it suffices to pull the ball of the lever so as to disengage the pawl m from the toothed part of segment m and to bring back lever I in resting position in which it is held by engagement of pawl m into the recess in segment on.

This is the releasing operation: it frees the armature e and the pinions rotate freely without driving the secondary shaft K.

For this action a pedal could be used instead of the lever I.

Combining the numbers of teeth into engagement, any succe'sion of s ds can be obtained, as in the similar meciih disms.

. During electrical working, a rheostat the mechanical efficiency aqa placed on circuit of the magnets enables the desired progressivity and suppleness to be obtained when passing from one speed to another.

The device hereinbefore described offers many advantages.

Transmission of motion is silent even during the speed changes which are made without sliding as the teeth are always in mesh; is good owing to the perfect balancing of drivin -couple, to

the large working surfaces 0 the teeth which need no beveled edge, to the 111111101 bility of the pinions in relation to each other in the case of direct engagement and consequently wear is reduced to the minimum. The whole can be very easily adapted to the motor to form the arra ment called monobloc while the shaft ma be an extension of the crank shaft of themotor.

It is to be, noted that the periphery of plate D may be toothed to drive at desired ratio a pinion d which may control an electric dynamo or any other accessory. A pinion as d, actuated by an auxiliary starting motor, may also be used forautomatic starting of the driving shaft without other intermediary transmission. As will be readily understood, this mechanism is more especially suitable for motor-cars, but it may be generally resorted to in many other cases.

1. A change speed gear comprising a drive A shaft, a driven shaft, a frame havingbearings for said shafts, two pairs of sun gears of different diameters loose on said drive shaft and revoluble independently of one another, an element fast to the drive shaftv and having bearings, intermediate shafts mounted in said bearings of said element and having pairs'of planet gears of different diameters at'their ends and which respectively engage the sun gears, armatures, one of which is secured to each of the sun gears for rotation therewith, fixed electromagnets for coaction respectively with the armatures of the sun gears of one pair, electro-magnets arranged for rotation with the driven shaft for coaction respectively with the sun gears of the other pair, means to lock one of said armatures to one of said revolubly mounted electro-magnets, and mechanically actuated braking means for one of the armatures which coacts with the fixed electro-magnets.

- in said bearings of said element and having pa rsof planet gears of. d ff r nt diamof the other pair, screws to lock one of said armatures to one of said revolubly mounted i electromagnets, and mechanically actuated braking means for one of the a-rmatures which coacts with the fixed elcctro-magnets. In witness whereof I affix my signature.

JEAN COTAL. 

